Mailbox insert



FIG. 1 is a perspective view of a mailbox insert showing my new design, in an assembled position and in a used condition with a broken line mailbox;

FIG. 2 is a perspective view thereof;

FIG. 3 is another perspective view thereof, shown in an assembled position without the mailbox;

FIG. 4 is a front view thereof;

FIG. 5 is a rear view thereof;

FIG. 6 is a left-side view thereof;

FIG. 7 is a right-side view thereof;

FIG. 8 is a top plan view thereof;

FIG. 9 is a bottom plan view thereof; and,

FIG. 10 is another perspective view thereof, shown in a disassembled position.

The broken lines of the mailbox in FIGS. 1 and 2 form no part of the claimed design. 

CLAIM The ornamental design for a mailbox insert, as shown and described. 